rust-index: document safety invariants being upheld for every `unsafe` block We've added a lot of `unsafe` code that shares Rust structs with Python. While this is unfortunate, it is also unavoidable, so let's at least systematically explain why each call to `unsafe` is sound. If any of the unsafe code ends up being wrong (because everyone screws up at some point), this change at least continues the unspoken rule of always explaining the need for `unsafe`, so we at least get a chance to think.

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# See http://EditorConfig.org for the specification

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root = true

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[*.py]

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indent_size = 4

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trim_trailing_whitespace = true

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end_of_line = lf

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[*.{c,h}]

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indent_size = 8

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indent_style = tab

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trim_trailing_whitespace = true

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end_of_line = lf

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[*.t]

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indent_size = 2

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indent_style = space

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trim_trailing_whitespace = false

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end_of_line = lf